PI33497: WMQ: CSQE034E CSQ0 CSQERWI2 RECOVERY PHASE 2 FAILED FOR STRUCTURE RC=00000004 REASON=00000412

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An outage occurred for the Queue Sharing Group (QSG).  One
  memeber of the QSG received
   CSQE034E CSQ0 CSQERWI2 Recovery phase 2 failed for
   structure CICS connection name CSQEMQGPCSQ002, RC=00000004
   reason=00000412
  
  xxxx0412 means
   IxlRsnCodeLockHeldBySys:  For a LOCKOPER=READNEXT or
   LOCKOPER=TEST request, the lock is not generally available.
   The lock is not held by any connection, but instead is held by
   the system.
  
  Another member of the QSG received
   Dump Title: CSQL,ABN=5C6-00C510AD,U=SYSOPR  ,C=R3600.710.CFM
   -CSQEOCRQ,M=CSQGFRCV,LOC=CSQELPLM.CSQEOCRQ+00000C1A
  
   Dump Title: CSQL,ABN=026-08110102,U=SYSOPR  ,C=R3600.710.CFM
   -CSQERWI2,M=CSQGFRCV,PSW=470C400081442702
  
   Dump Title: ABEND=S026,REASON=08118001,CONNECTOR HANG:
   CONNAME=CSQEMQGPCSQL06,JOBNAME=CSQLMSTR
  
  In response to an EEPLDISCFAILCONNECTION event, a queue manager
  may need to get locks on the list headers in the structure in
  order to perform recovery processing.  This results in an
  unconditional list lock request being made from phase 2
  recovery. If the lock was held by one of the failed
  connections, XES will not release the lock until the connection
  failure event has been resolved.  This causes the structure
  recovery processing to hang in the unconditional list lock
  request.  This task remains stuck until XES hang resolution
  processing abends the queue manager task with the  026 abend.
  
  
  
  Additional Symptom(s) Search Keyword(s):
  
  00C510AD 08110102 08118001 ABEND026 ABENDS026 026 S026 S0026
  0412
  

Local fix

• Restart of the failed queue manager should be successful
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Peer level recovery (PLR) for a failed  *
  *                      connector to a structure hangs waiting  *
  *                      for a lock unconditionally, leading to  *
  *                      abend 026-08110101 in CSQELPLM.CSQERWI2 *
  *                      initially, followed later by abend      *
  *                      026-08110102 in CSQELPLM.CSQERWI2 and   *
  *                      abnormal queue manager termination      *
  *                      6C6 with REASON=00C510AB.               *
  *                      While the connector is hung, other      *
  *                      queue managers attempting to lock the   *
  *                      same list header can fail with return   *
  *                      code IxlRsnCodeLockHeldBySys (00000412) *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During Peer Level Recovery (PLR) for a failed connection to a
  structure, CSQERWI2 issues an unconditional request for a lock
  on a list header in the structure.
  While CSQERWI2 waited for the lock to become available, the
  current holder of the lock also failed, leading to XCF taking
  ownership of the lock until the failure events have been
  responded to.
  However, while CSQERWI2 is waiting for the lock, it is unable
  to respond to any failure events, leading to a deadlock
  condition occurring.
  

Problem conclusion

• CSQERWI2 is changed to handle the holder of the required lock
  failing during PLR.
  100Y
  CSQEQUER
  CSQERWI2
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  PI44852 UI29667

Modules/Macros

• CSQEQUER CSQERWI2
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI29667

     UP15/08/11 P F508 ¢

Fix is available

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